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Five teenagers were threatened at knifepoint after witnessing an attack on a Central Line train.

Four boys and a girl, all aged 14, were confronted by a man holding a flick knife at Theydon Bois in east London.

CCTV image of a man [police are looking for Credit: British Transport Police

Detective Constable Carl Wayte, from British Transport Police said: "A man was attacking another passenger on an eastbound Central line train as it travelled between Loughton and Theydon Bois London Underground stations.

During the journey four boys and a girl, all aged 14, witnessed the incident and alerted other passengers.

The teens left the train at Theydon Bois and the man also left the service. “He then produced a flick knife and threatened the group on the platform"

CCTV image taken at Theydon Bois Credit: British Transport Police

Anyone with information is asked to contact British Transport Police on 0800 40 50 40.